21031320332 has 12 divisors (see below), whose sum is σ = 40150702536. Its totient is φ = 9559691040.

The previous prime is 21031320307. The next prime is 21031320397. The reversal of 21031320332 is 23302313012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238992233 + ... + 238992320.

It is an arithmetic number, because the mean of its divisors is an integer number (3345891878).

Almost surely, 2^21031320332 is an apocalyptic number.

21031320332 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21031320332 is a deficient number, since it is larger than the sum of its proper divisors (19119382204).

21031320332 is a wasteful number, since it uses less digits than its factorization.

21031320332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477984568 (or 477984566 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21031320332 its reverse (23302313012), we get a palindrome (44333633344).

The spelling of 21031320332 in words is "twenty-one billion, thirty-one million, three hundred twenty thousand, three hundred thirty-two".